# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Obtain the mIoU of Cityscapes test set:
1. Use tools/predict.py to generate result images.
2. Use cityscapes_trainid2labelid.py to convert the result images from trainid to labelid.
3. Submit the converted results to Cityscapes website.
"""

import argparse
import os
from collections import namedtuple

import numpy as np
from PIL import Image
from tqdm import tqdm

from paddleseg.utils import get_image_list


def parse_args():
    parser = argparse.ArgumentParser(description='')
    parser.add_argument(
        "--root_dir",
        type=str,
        help="The root dir of the result images generated by predict.py")
    return parser.parse_args()


def mkdir(path):
    sub_dir = os.path.dirname(path)
    if not os.path.exists(sub_dir):
        os.makedirs(sub_dir)


def clear(dire):
    import shutil
    for root, dirs, files in os.walk(dire):
        if '.ipynb_checkpoints' in root:
            shutil.rmtree(root)

    for root, dirs, files in os.walk(dire):
        if '.ipynb_checkpoints' in root:
            print(root)


#--------------------------------------------------------------------------------
# Definitions
#--------------------------------------------------------------------------------

# a label and all meta information
Label = namedtuple(
    'Label',
    [
        'name',  # The identifier of this label, e.g. 'car', 'person', ... .
        # We use them to uniquely name a class
        'id',  # An integer ID that is associated with this label.
        # The IDs are used to represent the label in ground truth images
        # An ID of -1 means that this label does not have an ID and thus
        # is ignored when creating ground truth images (e.g. license plate).
        # Do not modify these IDs, since exactly these IDs are expected by the
        # evaluation server.
        'trainId',  # Feel free to modify these IDs as suitable for your method. Then create
        # ground truth images with train IDs, using the tools provided in the
        # 'preparation' folder. However, make sure to validate or submit results
        # to our evaluation server using the regular IDs above!
        # For trainIds, multiple labels might have the same ID. Then, these labels
        # are mapped to the same class in the ground truth images. For the inverse
        # mapping, we use the label that is defined first in the list below.
        # For example, mapping all void-type classes to the same ID in training,
        # might make sense for some approaches.
        # Max value is 255!
        'category',  # The name of the category that this label belongs to
        'categoryId',  # The ID of this category. Used to create ground truth images
        # on category level.
        'hasInstances',  # Whether this label distinguishes between single instances or not
        'ignoreInEval',  # Whether pixels having this class as ground truth label are ignored
        # during evaluations or not
        'color',  # The color of this label
    ])

#--------------------------------------------------------------------------------
# A list of all labels
#--------------------------------------------------------------------------------

# Please adapt the train IDs as appropriate for your approach.
# Note that you might want to ignore labels with ID 255 during training.
# Further note that the current train IDs are only a suggestion. You can use whatever you like.
# Make sure to provide your results using the original IDs and not the training IDs.
# Note that many IDs are ignored in evaluation and thus you never need to predict these!

labels = [
    #       name                     id    trainId   category            catId     hasInstances   ignoreInEval   color
    Label('unlabeled', 0, 255, 'void', 0, False, True, (0, 0, 0)),
    Label('ego vehicle', 1, 255, 'void', 0, False, True, (0, 0, 0)),
    Label('rectification border', 2, 255, 'void', 0, False, True, (0, 0, 0)),
    Label('out of roi', 3, 255, 'void', 0, False, True, (0, 0, 0)),
    Label('static', 4, 255, 'void', 0, False, True, (0, 0, 0)),
    Label('dynamic', 5, 255, 'void', 0, False, True, (111, 74, 0)),
    Label('ground', 6, 255, 'void', 0, False, True, (81, 0, 81)),
    Label('road', 7, 0, 'flat', 1, False, False, (128, 64, 128)),
    Label('sidewalk', 8, 1, 'flat', 1, False, False, (244, 35, 232)),
    Label('parking', 9, 255, 'flat', 1, False, True, (250, 170, 160)),
    Label('rail track', 10, 255, 'flat', 1, False, True, (230, 150, 140)),
    Label('building', 11, 2, 'construction', 2, False, False, (70, 70, 70)),
    Label('wall', 12, 3, 'construction', 2, False, False, (102, 102, 156)),
    Label('fence', 13, 4, 'construction', 2, False, False, (190, 153, 153)),
    Label('guard rail', 14, 255, 'construction', 2, False, True,
          (180, 165, 180)),
    Label('bridge', 15, 255, 'construction', 2, False, True, (150, 100, 100)),
    Label('tunnel', 16, 255, 'construction', 2, False, True, (150, 120, 90)),
    Label('pole', 17, 5, 'object', 3, False, False, (153, 153, 153)),
    Label('polegroup', 18, 255, 'object', 3, False, True, (153, 153, 153)),
    Label('traffic light', 19, 6, 'object', 3, False, False, (250, 170, 30)),
    Label('traffic sign', 20, 7, 'object', 3, False, False, (220, 220, 0)),
    Label('vegetation', 21, 8, 'nature', 4, False, False, (107, 142, 35)),
    Label('terrain', 22, 9, 'nature', 4, False, False, (152, 251, 152)),
    Label('sky', 23, 10, 'sky', 5, False, False, (70, 130, 180)),
    Label('person', 24, 11, 'human', 6, True, False, (220, 20, 60)),
    Label('rider', 25, 12, 'human', 6, True, False, (255, 0, 0)),
    Label('car', 26, 13, 'vehicle', 7, True, False, (0, 0, 142)),
    Label('truck', 27, 14, 'vehicle', 7, True, False, (0, 0, 70)),
    Label('bus', 28, 15, 'vehicle', 7, True, False, (0, 60, 100)),
    Label('caravan', 29, 255, 'vehicle', 7, True, True, (0, 0, 90)),
    Label('trailer', 30, 255, 'vehicle', 7, True, True, (0, 0, 110)),
    Label('train', 31, 16, 'vehicle', 7, True, False, (0, 80, 100)),
    Label('motorcycle', 32, 17, 'vehicle', 7, True, False, (0, 0, 230)),
    Label('bicycle', 33, 18, 'vehicle', 7, True, False, (119, 11, 32)),
    Label('license plate', -1, -1, 'vehicle', 7, False, True, (0, 0, 142)),
]

if __name__ == '__main__':
    args = parse_args()

    root_dir = args.root_dir
    im_dir = os.path.join(root_dir, 'pseudo_color_prediction')
    result_dir = os.path.join(root_dir, 'convert_to_labelid')

    image_list, _ = get_image_list(im_dir)
    trainid2labelid = {label.trainId: label.id for label in reversed(labels)}

    for i in tqdm(range(len(image_list))):
        im_path = image_list[i]
        im_split = im_path.split('/')

        im = Image.open(im_path)
        im = np.asarray(im)
        new_im = np.ones_like(im) * 200
        for k in trainid2labelid:
            new_im[im == k] = trainid2labelid[k]

        new_im = Image.fromarray(new_im)
        result_path = os.path.join(result_dir, im_split[-2], im_split[-1])
        mkdir(result_path)
        new_im.save(result_path)

    clear(result_dir)
